path: root/Documentation
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authorLinus Torvalds <torvalds@linux-foundation.org>2013-05-09 13:07:40 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2013-05-09 13:07:40 -0700
commit983a5f84a4a11c8706ca70615125db711336b684 (patch)
treebbf16b836903aaf523e7c637a0d7191ba8fa172d /Documentation
parent8769e078a9a2bce13d39c08e0e5a513f5320e1de (diff)
parent667e7d94a1683661cff5fe9a0fa0d7f8fdd2c007 (diff)
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mason/linux-btrfs
Pull btrfs update from Chris Mason: "These are mostly fixes. The biggest exceptions are Josef's skinny extents and Jan Schmidt's code to rebuild our quota indexes if they get out of sync (or you enable quotas on an existing filesystem). The skinny extents are off by default because they are a new variation on the extent allocation tree format. btrfstune -x enables them, and the new format makes the extent allocation tree about 30% smaller. I rebased this a few days ago to rework Dave Sterba's crc checks on the super block, but almost all of these go back to rc6, since I though 3.9 was due any minute. The biggest missing fix is the tracepoint bug that was hit late in 3.9. I ran into problems with that in overnight testing and I'm still tracking it down. I'll definitely have that fixed for rc2." * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mason/linux-btrfs: (101 commits) Btrfs: allow superblock mismatch from older mkfs btrfs: enhance superblock checks btrfs: fix misleading variable name for flags btrfs: use unsigned long type for extent state bits Btrfs: improve the loop of scrub_stripe btrfs: read entire device info under lock btrfs: remove unused gfp mask parameter from release_extent_buffer callchain btrfs: handle errors returned from get_tree_block_key btrfs: make static code static & remove dead code Btrfs: deal with errors in write_dev_supers Btrfs: remove almost all of the BUG()'s from tree-log.c Btrfs: deal with free space cache errors while replaying log Btrfs: automatic rescan after "quota enable" command Btrfs: rescan for qgroups Btrfs: split btrfs_qgroup_account_ref into four functions Btrfs: allocate new chunks if the space is not enough for global rsv Btrfs: separate sequence numbers for delayed ref tracking and tree mod log btrfs: move leak debug code to functions Btrfs: return free space in cow error path Btrfs: set UUID in root_item for created trees ...
Diffstat (limited to 'Documentation')
1 files changed, 173 insertions, 7 deletions
diff --git a/Documentation/filesystems/btrfs.txt b/Documentation/filesystems/btrfs.txt
index 7671352216f..b349d57b76e 100644
--- a/Documentation/filesystems/btrfs.txt
+++ b/Documentation/filesystems/btrfs.txt
@@ -1,8 +1,8 @@
- =====
-Btrfs is a new copy on write filesystem for Linux aimed at
+Btrfs is a copy on write filesystem for Linux aimed at
implementing advanced features while focusing on fault tolerance,
repair and easy administration. Initially developed by Oracle, Btrfs
is licensed under the GPL and open for contribution from anyone.
@@ -34,9 +34,175 @@ The main Btrfs features include:
* Online filesystem defragmentation
+Mount Options
- ============
+When mounting a btrfs filesystem, the following option are accepted.
+Unless otherwise specified, all options default to off.
+ alloc_start=<bytes>
+ Debugging option to force all block allocations above a certain
+ byte threshold on each block device. The value is specified in
+ bytes, optionally with a K, M, or G suffix, case insensitive.
+ Default is 1MB.
+ autodefrag
+ Detect small random writes into files and queue them up for the
+ defrag process. Works best for small files; Not well suited for
+ large database workloads.
+ check_int
+ check_int_data
+ check_int_print_mask=<value>
+ These debugging options control the behavior of the integrity checking
+ module (the BTRFS_FS_CHECK_INTEGRITY config option required).
+ check_int enables the integrity checker module, which examines all
+ block write requests to ensure on-disk consistency, at a large
+ memory and CPU cost.
+ check_int_data includes extent data in the integrity checks, and
+ implies the check_int option.
+ check_int_print_mask takes a bitmask of BTRFSIC_PRINT_MASK_* values
+ as defined in fs/btrfs/check-integrity.c, to control the integrity
+ checker module behavior.
+ See comments at the top of fs/btrfs/check-integrity.c for more info.
+ compress
+ compress=<type>
+ compress-force
+ compress-force=<type>
+ Control BTRFS file data compression. Type may be specified as "zlib"
+ "lzo" or "no" (for no compression, used for remounting). If no type
+ is specified, zlib is used. If compress-force is specified,
+ all files will be compressed, whether or not they compress well.
+ If compression is enabled, nodatacow and nodatasum are disabled.
+ degraded
+ Allow mounts to continue with missing devices. A read-write mount may
+ fail with too many devices missing, for example if a stripe member
+ is completely missing.
+ device=<devicepath>
+ Specify a device during mount so that ioctls on the control device
+ can be avoided. Especialy useful when trying to mount a multi-device
+ setup as root. May be specified multiple times for multiple devices.
+ discard
+ Issue frequent commands to let the block device reclaim space freed by
+ the filesystem. This is useful for SSD devices, thinly provisioned
+ LUNs and virtual machine images, but may have a significant
+ performance impact. (The fstrim command is also available to
+ initiate batch trims from userspace).
+ enospc_debug
+ Debugging option to be more verbose in some ENOSPC conditions.
+ fatal_errors=<action>
+ Action to take when encountering a fatal error:
+ "bug" - BUG() on a fatal error. This is the default.
+ "panic" - panic() on a fatal error.
+ flushoncommit
+ The 'flushoncommit' mount option forces any data dirtied by a write in a
+ prior transaction to commit as part of the current commit. This makes
+ the committed state a fully consistent view of the file system from the
+ application's perspective (i.e., it includes all completed file system
+ operations). This was previously the behavior only when a snapshot is
+ created.
+ inode_cache
+ Enable free inode number caching. Defaults to off due to an overflow
+ problem when the free space crcs don't fit inside a single page.
+ max_inline=<bytes>
+ Specify the maximum amount of space, in bytes, that can be inlined in
+ a metadata B-tree leaf. The value is specified in bytes, optionally
+ with a K, M, or G suffix, case insensitive. In practice, this value
+ is limited by the root sector size, with some space unavailable due
+ to leaf headers. For a 4k sectorsize, max inline data is ~3900 bytes.
+ metadata_ratio=<value>
+ Specify that 1 metadata chunk should be allocated after every <value>
+ data chunks. Off by default.
+ noacl
+ Disable support for Posix Access Control Lists (ACLs). See the
+ acl(5) manual page for more information about ACLs.
+ nobarrier
+ Disables the use of block layer write barriers. Write barriers ensure
+ that certain IOs make it through the device cache and are on persistent
+ storage. If used on a device with a volatile (non-battery-backed)
+ write-back cache, this option will lead to filesystem corruption on a
+ system crash or power loss.
+ nodatacow
+ Disable data copy-on-write for newly created files. Implies nodatasum,
+ and disables all compression.
+ nodatasum
+ Disable data checksumming for newly created files.
+ notreelog
+ Disable the tree logging used for fsync and O_SYNC writes.
+ recovery
+ Enable autorecovery attempts if a bad tree root is found at mount time.
+ Currently this scans a list of several previous tree roots and tries to
+ use the first readable.
+ skip_balance
+ Skip automatic resume of interrupted balance operation after mount.
+ May be resumed with "btrfs balance resume."
+ space_cache (*)
+ Enable the on-disk freespace cache.
+ nospace_cache
+ Disable freespace cache loading without clearing the cache.
+ clear_cache
+ Force clearing and rebuilding of the disk space cache if something
+ has gone wrong.
+ ssd
+ nossd
+ ssd_spread
+ Options to control ssd allocation schemes. By default, BTRFS will
+ enable or disable ssd allocation heuristics depending on whether a
+ rotational or nonrotational disk is in use. The ssd and nossd options
+ can override this autodetection.
+ The ssd_spread mount option attempts to allocate into big chunks
+ of unused space, and may perform better on low-end ssds. ssd_spread
+ implies ssd, enabling all other ssd heuristics as well.
+ subvol=<path>
+ Mount subvolume at <path> rather than the root subvolume. <path> is
+ relative to the top level subvolume.
+ subvolid=<ID>
+ Mount subvolume specified by an ID number rather than the root subvolume.
+ This allows mounting of subvolumes which are not in the root of the mounted
+ filesystem.
+ You can use "btrfs subvolume list" to see subvolume ID numbers.
+ subvolrootid=<objectid> (deprecated)
+ Mount subvolume specified by <objectid> rather than the root subvolume.
+ This allows mounting of subvolumes which are not in the root of the mounted
+ filesystem.
+ You can use "btrfs subvolume show " to see the object ID for a subvolume.
+ thread_pool=<number>
+ The number of worker threads to allocate. The default number is equal
+ to the number of CPUs + 2, or 8, whichever is smaller.
+ user_subvol_rm_allowed
+ Allow subvolumes to be deleted by a non-root user. Use with caution.
There is a Btrfs mailing list hosted on vger.kernel.org. You can
find details on how to subscribe here:
@@ -49,8 +215,8 @@ http://dir.gmane.org/gmane.comp.file-systems.btrfs
- ===
Discussion of Btrfs also occurs on the #btrfs channel of the Freenode
IRC network.